/* Generated by tools/apply_lesson_art.py from lesson_art_manifest.json. */
.lesson-page {
  --lesson-art: none;
  --lesson-accent: #76ddd0;
  --lesson-accent-rgb: 118, 221, 208;
  --lesson-art-position: 75% 50%;
  --lesson-ambient-position: 82% 18%;
}

.lesson-page .course-main {
  background:
    radial-gradient(circle at var(--lesson-ambient-position), rgba(var(--lesson-accent-rgb), 0.11), transparent 34rem),
    linear-gradient(180deg, rgba(var(--lesson-accent-rgb), 0.025), transparent 56rem);
}

.lesson-page .lesson-hero {
  background-image:
    linear-gradient(90deg, rgba(3, 16, 13, 0.98) 0%, rgba(3, 16, 13, 0.92) 34%, rgba(3, 16, 13, 0.48) 68%, rgba(3, 16, 13, 0.76) 100%),
    linear-gradient(180deg, rgba(3, 16, 13, 0.1), rgba(3, 16, 13, 0.48)),
    var(--lesson-art);
  background-position: center, center, var(--lesson-art-position);
  background-size: cover;
  background-repeat: no-repeat;
}

.lesson-page .lesson-hero::before {
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(var(--lesson-accent-rgb), 0.2) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--lesson-accent-rgb), 0.16) 1px, transparent 1px);
  background-size: 3.5rem 3.5rem;
  mask-image: linear-gradient(90deg, #000 0%, #000 30%, transparent 82%);
}

.lesson-page[data-art-pattern="orbit"] .lesson-hero::before {
  opacity: 0.28;
  background-image:
    radial-gradient(circle at 78% 56%, transparent 0 5rem, rgba(var(--lesson-accent-rgb), 0.35) 5.06rem 5.14rem, transparent 5.2rem 9rem, rgba(245, 184, 75, 0.3) 9.06rem 9.14rem, transparent 9.2rem),
    radial-gradient(circle at 78% 56%, rgba(var(--lesson-accent-rgb), 0.14), transparent 20rem);
  background-size: 100% 100%;
  mask-image: linear-gradient(90deg, transparent 18%, #000 58%, #000 100%);
}

.lesson-page[data-art-pattern="flow"] .lesson-hero::before {
  opacity: 0.23;
  background-image:
    repeating-linear-gradient(112deg, transparent 0 2.8rem, rgba(var(--lesson-accent-rgb), 0.28) 2.84rem 2.9rem, transparent 2.96rem 5.8rem);
  background-size: 100% 100%;
  mask-image: linear-gradient(90deg, #000 0%, transparent 74%);
}

.lesson-page[data-art-pattern="branch"] .lesson-hero::before {
  opacity: 0.25;
  background-image:
    linear-gradient(35deg, transparent 48%, rgba(var(--lesson-accent-rgb), 0.32) 49%, transparent 50%),
    linear-gradient(-35deg, transparent 48%, rgba(245, 184, 75, 0.24) 49%, transparent 50%);
  background-size: 8rem 8rem;
  mask-image: linear-gradient(90deg, #000 0%, #000 28%, transparent 78%);
}

.lesson-page[data-art-pattern="cells"] .lesson-hero::before {
  opacity: 0.2;
  background-size: 2.2rem 2.2rem;
  mask-image: linear-gradient(90deg, #000 0%, #000 32%, transparent 80%);
}

.lesson-page .lesson-hero::after {
  border-color: rgba(var(--lesson-accent-rgb), 0.3);
  box-shadow:
    0 0 0 4rem rgba(var(--lesson-accent-rgb), 0.035),
    0 0 0 8rem rgba(245, 184, 75, 0.018);
}

.lesson-page .lesson-hero-inner {
  position: relative;
  z-index: 1;
}

.lesson-page .lesson-hero h1 {
  text-shadow: 0 0.15rem 1.2rem rgba(0, 0, 0, 0.62);
}

.lesson-page .lesson-article {
  background:
    linear-gradient(135deg, rgba(var(--lesson-accent-rgb), 0.075), transparent 18rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.28), transparent 14rem),
    var(--paper);
}

.lesson-visual {
  position: relative;
  width: 100%;
  margin: 0 0 clamp(1.75rem, 4vw, 3rem);
  overflow: hidden;
  border: 1px solid rgba(var(--lesson-accent-rgb), 0.52);
  border-radius: 0.72rem;
  background: #03100d;
  box-shadow:
    0 1.2rem 3rem rgba(3, 16, 13, 0.23),
    0 0 0 0.35rem rgba(var(--lesson-accent-rgb), 0.055);
}

.lesson-visual::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.lesson-visual img,
.lesson-article .lesson-visual img {
  display: block;
  width: 100%;
  max-width: none;
  aspect-ratio: 3 / 2;
  height: auto;
  max-height: none;
  margin: 0;
  border: 0;
  border-radius: 0;
  object-fit: cover;
}

.lesson-article details.programming-insight,
.lesson-article details.reveal-answer {
  margin: 1.2rem 0;
  border: 1px solid rgba(var(--lesson-accent-rgb), 0.48);
  border-radius: 0.55rem;
  padding: 0.9rem 1rem;
  background:
    linear-gradient(145deg, rgba(var(--lesson-accent-rgb), 0.11), rgba(255, 255, 255, 0.32)),
    rgba(255, 255, 255, 0.38);
  box-shadow: 0 0.55rem 1.4rem rgba(31, 52, 42, 0.075);
}

.lesson-article details.programming-insight > summary,
.lesson-article details.reveal-answer > summary {
  color: #174f36;
  cursor: pointer;
  font-weight: 780;
  line-height: 1.45;
}

.lesson-article details.programming-insight > summary::marker,
.lesson-article details.reveal-answer > summary::marker {
  color: var(--paper-green);
}

.lesson-article details.programming-insight[open] > summary,
.lesson-article details.reveal-answer[open] > summary {
  margin-bottom: 0.8rem;
}

.lesson-article details.programming-insight > :not(summary):last-child,
.lesson-article details.reveal-answer > :not(summary):last-child {
  margin-bottom: 0;
}

@media (max-width: 800px) {
  .lesson-page .lesson-hero {
    background-image:
      linear-gradient(90deg, rgba(3, 16, 13, 0.96), rgba(3, 16, 13, 0.72)),
      linear-gradient(180deg, rgba(3, 16, 13, 0.12), rgba(3, 16, 13, 0.62)),
      var(--lesson-art);
    background-position: center, center, center;
  }

  .lesson-page .lesson-hero::before {
    opacity: 0.12;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-visual,
  .lesson-page .lesson-hero {
    background-attachment: scroll;
  }
}

body[data-lesson="01"] {
  --lesson-art: url("../images/lesson-art/lesson-01-appropriate-programmer.png");
  --lesson-accent: #76ddd0;
  --lesson-accent-rgb: 118, 221, 208;
  --lesson-art-position: 76% 48%;
  --lesson-ambient-position: 82% 16%;
}

body[data-lesson="02"] {
  --lesson-art: url("../images/lesson-art/lesson-02-variable.png");
  --lesson-accent: #f2bd59;
  --lesson-accent-rgb: 242, 189, 89;
  --lesson-art-position: 72% 50%;
  --lesson-ambient-position: 76% 22%;
}

body[data-lesson="03"] {
  --lesson-art: url("../images/lesson-art/lesson-03-declare-assign.png");
  --lesson-accent: #82d9ff;
  --lesson-accent-rgb: 130, 217, 255;
  --lesson-art-position: 78% 50%;
  --lesson-ambient-position: 88% 28%;
}

body[data-lesson="04"] {
  --lesson-art: url("../images/lesson-art/lesson-04-function.png");
  --lesson-accent: #75d6ad;
  --lesson-accent-rgb: 117, 214, 173;
  --lesson-art-position: 74% 50%;
  --lesson-ambient-position: 72% 20%;
}

body[data-lesson="05"] {
  --lesson-art: url("../images/lesson-art/lesson-05-main-function.png");
  --lesson-accent: #f4c464;
  --lesson-accent-rgb: 244, 196, 100;
  --lesson-art-position: 80% 50%;
  --lesson-ambient-position: 84% 15%;
}

body[data-lesson="06"] {
  --lesson-art: url("../images/lesson-art/lesson-06-calling-returning.png");
  --lesson-accent: #79dcea;
  --lesson-accent-rgb: 121, 220, 234;
  --lesson-art-position: 70% 46%;
  --lesson-ambient-position: 68% 26%;
}

body[data-lesson="07"] {
  --lesson-art: url("../images/lesson-art/lesson-07-header-files.png");
  --lesson-accent: #98e0bf;
  --lesson-accent-rgb: 152, 224, 191;
  --lesson-art-position: 78% 47%;
  --lesson-ambient-position: 85% 24%;
}

body[data-lesson="08"] {
  --lesson-art: url("../images/lesson-art/lesson-08-namespaces.png");
  --lesson-accent: #7fdad6;
  --lesson-accent-rgb: 127, 218, 214;
  --lesson-art-position: 75% 52%;
  --lesson-ambient-position: 80% 18%;
}

body[data-lesson="09"] {
  --lesson-art: url("../images/lesson-art/lesson-09-hello-world.png");
  --lesson-accent: #f0bd5c;
  --lesson-accent-rgb: 240, 189, 92;
  --lesson-art-position: 82% 46%;
  --lesson-ambient-position: 88% 20%;
}

body[data-lesson="10"] {
  --lesson-art: url("../images/lesson-art/lesson-10-for-loop.png");
  --lesson-accent: #7fd6ff;
  --lesson-accent-rgb: 127, 214, 255;
  --lesson-art-position: 76% 48%;
  --lesson-ambient-position: 78% 28%;
}

body[data-lesson="11"] {
  --lesson-art: url("../images/lesson-art/lesson-11-while-do-loops.png");
  --lesson-accent: #78dcc0;
  --lesson-accent-rgb: 120, 220, 192;
  --lesson-art-position: 70% 48%;
  --lesson-ambient-position: 72% 16%;
}

body[data-lesson="12"] {
  --lesson-art: url("../images/lesson-art/lesson-12-if-statement.png");
  --lesson-accent: #f1c25f;
  --lesson-accent-rgb: 241, 194, 95;
  --lesson-art-position: 78% 50%;
  --lesson-ambient-position: 86% 30%;
}

body[data-lesson="13"] {
  --lesson-art: url("../images/lesson-art/lesson-13-conditional-operator.png");
  --lesson-accent: #8bd9d0;
  --lesson-accent-rgb: 139, 217, 208;
  --lesson-art-position: 74% 51%;
  --lesson-ambient-position: 78% 14%;
}

body[data-lesson="14"] {
  --lesson-art: url("../images/lesson-art/lesson-14-manipulating-memory.png");
  --lesson-accent: #74d8ca;
  --lesson-accent-rgb: 116, 216, 202;
  --lesson-art-position: 74% 52%;
  --lesson-ambient-position: 82% 24%;
}

body[data-lesson="15"] {
  --lesson-art: url("../images/lesson-art/lesson-15-heap-memory.png");
  --lesson-accent: #efb957;
  --lesson-accent-rgb: 239, 185, 87;
  --lesson-art-position: 78% 50%;
  --lesson-ambient-position: 88% 18%;
}

body[data-lesson="16"] {
  --lesson-art: url("../images/lesson-art/lesson-16-scope-extent.png");
  --lesson-accent: #9ad7b4;
  --lesson-accent-rgb: 154, 215, 180;
  --lesson-art-position: 72% 48%;
  --lesson-ambient-position: 72% 26%;
}

body[data-lesson="17"] {
  --lesson-art: url("../images/lesson-art/lesson-17-array.png");
  --lesson-accent: #7be0d1;
  --lesson-accent-rgb: 123, 224, 209;
  --lesson-art-position: 68% 50%;
  --lesson-ambient-position: 74% 18%;
}

body[data-lesson="18"] {
  --lesson-art: url("../images/lesson-art/lesson-18-classes-objects.png");
  --lesson-accent: #f0c16a;
  --lesson-accent-rgb: 240, 193, 106;
  --lesson-art-position: 76% 50%;
  --lesson-ambient-position: 86% 24%;
}

body[data-lesson="19"] {
  --lesson-art: url("../images/lesson-art/lesson-19-inheritance.png");
  --lesson-accent: #7bd6bd;
  --lesson-accent-rgb: 123, 214, 189;
  --lesson-art-position: 72% 54%;
  --lesson-ambient-position: 76% 12%;
}

body[data-lesson="20"] {
  --lesson-art: url("../images/lesson-art/lesson-20-friend-function.png");
  --lesson-accent: #efb956;
  --lesson-accent-rgb: 239, 185, 86;
  --lesson-art-position: 74% 48%;
  --lesson-ambient-position: 84% 28%;
}

body[data-lesson="21"] {
  --lesson-art: url("../images/lesson-art/lesson-21-polymorphism.png");
  --lesson-accent: #86dcce;
  --lesson-accent-rgb: 134, 220, 206;
  --lesson-art-position: 70% 48%;
  --lesson-ambient-position: 76% 22%;
}

body[data-lesson="22"] {
  --lesson-art: url("../images/lesson-art/lesson-22-operator-overloading.png");
  --lesson-accent: #edbd67;
  --lesson-accent-rgb: 237, 189, 103;
  --lesson-art-position: 74% 50%;
  --lesson-ambient-position: 80% 16%;
}

body[data-lesson="23"] {
  --lesson-art: url("../images/lesson-art/lesson-23-templates.png");
  --lesson-accent: #79d9b7;
  --lesson-accent-rgb: 121, 217, 183;
  --lesson-art-position: 70% 50%;
  --lesson-ambient-position: 74% 26%;
}

body[data-lesson="24"] {
  --lesson-art: url("../images/lesson-art/lesson-24-destructor.png");
  --lesson-accent: #83d9cf;
  --lesson-accent-rgb: 131, 217, 207;
  --lesson-art-position: 74% 50%;
  --lesson-ambient-position: 86% 20%;
}